Monomeric Fe(iii) half-sandwich complexes [Cp'FeX2] - synthesis, properties and electronic structure.
Monomeric Fe(iii) half-sandwich complexes [Cp'FeX2] - synthesis, properties and electronic structure.
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单体 Fe(iii) 半夹心配合物 [CpFeX2] - 合成、性质和电子结构
DOI:
10.1039/c8dt01570h
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发表时间:
2018
影响因子:
4
通讯作者:
M. D. Walter
中科院分区:
文献类型:
--
作者:
M. Reiners;M. Maekawa;D. Baabe;M.-K. Zaretzke;P. Schweyen;C. G. Daniliuc;M. Freytag;J. Raeder;J. Hohenberger;J. Sutter;K. Meyer;M. D. Walter
The half-sandwich complex [Cp′Fe(μ-I)]2 (1; Cp′ = η5-1,2,4-(Me3C)3C5H2) is cleaved when heated in toluene to form a cation–anion pair [{Cp′Fe(η6-toluene)}+{Cp′FeI2}−] (2), in which the two Fe(II) atoms adopt different spin states, i.e., a low-spin (S = 0) and a high-spin (S = 2) configuration. Upon oxidation of 1 with C2H4I2, the thermally stable 15VE species [Cp′FeI2] (3) can be isolated, in which the Fe(III) atom adopts an intermediate spin (S = 3/2) configuration. Complex 3 is an excellent starting material for further functionalizations and it reacts with Mg(CH2SiMe3)2 to form the unprecedented Fe(III) (S = 3/2) bis(alkyl) complex [Cp′Fe(CH2SiMe3)2] (4). The respective spin states of complexes 2–4 are confirmed by single-crystal X-ray crystallography, zero-field 57Fe Mössbauer spectroscopy, and solid-state magnetic susceptibility measurements. In contrast to the related 14VE high-spin (S = 2) Fe(II) alkyl species [Cp′FeCH(SiMe3)2], which resists the reaction with H2 as a consequence of a spin-induced reaction barrier, complex 4 reacts cleanly with H2 (8 bar) in cyclohexane to yield iron hydrides [{Cp′Fe}2(μ-H)3] (5) and [Cp′Fe(μ-H)2]2 (6) in a 1 : 4 ratio. However, when the hydrogenation of 4 is carried out in benzene, a green 19VE [Cp′Fe(η6-C6H6)] (A) intermediate is formed, which dimerizes to the bis(cyclohexadienyl)-bridged product [(Cp′Fe)2(μ2–η5:η5-C12H12)] (7). Further evidence for the intermediacy of [Cp′Fe(η6-C6H6)] (A) was gathered by X-band EPR and UV/vis spectroscopy. Interestingly, attempts to oxidize 7 with AgSbF6 proceeded via C–C bond cleavage instead of metal oxidation to form [Cp′Fe(C6H6)][SbF6] (8).
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影响因子:
7
作者:
M. Reiners;D. Baabe;K. Harms;M. Maekawa;C. G. Daniliuc;M. Freytag;P. G. Jones;M. D. Walter
通讯作者:
M. D. Walter
DOI:
--
发表时间:
1977
期刊:
影响因子:
--
作者:
R. Andersen;G. Wilkinson
通讯作者:
G. Wilkinson
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
W. Lukens;Milton R. Smith;R. Andersen
通讯作者:
R. Andersen
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
H. Sitzmann;G. Wolmershäuser
通讯作者:
G. Wolmershäuser
影响因子:
2.8
作者:
Matthias Reiners;D. Baabe;Peter Schweyen;M. Freytag;P. Jones;Marc D. Walter
通讯作者:
Matthias Reiners;D. Baabe;Peter Schweyen;M. Freytag;P. Jones;Marc D. Walter